<?xml version="1.0" encoding="UTF-8"?>
<!--
== Model: Version 0-3 NetD
== Package: cce
-->
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
  xmlns="http://scap.nist.gov/schema/cce/0.1"
  xmlns:scap-core="http://scap.nist.gov/schema/scap-core/0.1"
  targetNamespace="http://scap.nist.gov/schema/cce/0.1"
  elementFormDefault="qualified" attributeFormDefault="unqualified"
  version="0.1">
  <xsd:annotation>
    <xsd:documentation>CCE is at an early phase of adoption.  This schema is a work in progress and is far from
      final.  Additional work with using CCEs in a practical setting is required.</xsd:documentation>
  </xsd:annotation>
  <xsd:import namespace="http://scap.nist.gov/schema/scap-core/0.1" schemaLocation="scap-core_0.1.xsd"/>
  <!-- ================================================== -->
  <!-- =====  Simple Type Definitions  -->
  <!-- ================================================== -->
  <xsd:simpleType name="cceNamePatternType">
    <xsd:annotation>
      <xsd:documentation>The format for a CCE name is CCE-NNNNNNNNNNN, where NNNNNNNNNNN is a sequence number.</xsd:documentation>
    </xsd:annotation>
    <xsd:restriction base="xsd:token">
      <xsd:pattern value="CCE-[1-9]\d{0,10}"/>
    </xsd:restriction>
  </xsd:simpleType>
  <!-- ================================================== -->
  <!-- =====  Complex Type Definitions  -->
  <!-- ================================================== -->
  <!-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -->
  <!--  CCE  -->
  <!-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -->
  <xsd:complexType name="cceType">
    <xsd:sequence>
      <xsd:element name="definition" type="xsd:string" minOccurs="0"/>
      <xsd:element name="parameter" type="cceParameterType" minOccurs="0" maxOccurs="unbounded"/>
      <xsd:element name="technical-mechanisms" type="xsd:string" minOccurs="0" maxOccurs="unbounded"/>
      <xsd:element name="references" type="scap-core:referenceType" minOccurs="0" maxOccurs="unbounded"/>
    </xsd:sequence>
    <xsd:attribute name="id" type="cceNamePatternType" use="required"/>
  </xsd:complexType>
  <!-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -->
  <!--  CCE_Parameter  -->
  <!-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -->
  <xsd:complexType name="cceParameterType">
    <xsd:sequence>
      <xsd:element name="value" type="xsd:string" maxOccurs="unbounded"/>
    </xsd:sequence>
    <xsd:attribute name="identifier" type="xsd:token">
      <xsd:annotation>
        <xsd:documentation>TODO: What does this identify?</xsd:documentation>
      </xsd:annotation>
    </xsd:attribute>
    <xsd:attribute name="operator" type="xsd:token">
      <xsd:annotation>
        <xsd:documentation>TODO: should this be an enumeration?</xsd:documentation>
      </xsd:annotation>
    </xsd:attribute>
  </xsd:complexType>
</xsd:schema>